Hello, Dr. Greve, I am waiting for your new version of mris_preproc command that allows to project the max of activity within a column to the vertex on the surface. Could you kindly send me the command ASAP.
Thank you,
Xin
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From: Douglas N Greve [mailto:greve@nmr.mgh.harvard.edu] Sent: Thu 3/5/2009 1:01 PM To: Wang, Xin Cc: freesurfer Subject: Re: [Freesurfer] How to project fMRI activity of entire depth of cortex on to surface
Wang, Xin wrote:
Thank you, Dr. Greve.
Does _-projfrac-max 0 1_ register the maximal P value cross entire depth of cortex to the vertex on the surface?
yes
Does _-projfrac-avg 0 1 delta_ register the average P value cross entire depth of cortex to the vertex on the surface?
yes, but probably not what you want to do.
Can I use these flags in mris_preproc or mris_surf2surf during the surface-based group analysis?
No, but I can add it.
Xin
*From:* Douglas N Greve [mailto:greve@nmr.mgh.harvard.edu] *Sent:* Thu 3/5/2009 11:25 AM *To:* Wang, Xin *Cc:* freesurfer *Subject:* Re: [Freesurfer] How to project fMRI activity of entire depth of cortex on to surface
Do any of the other --proj flags do what you need? Eg, --projfrac-max? See the --help
doug
Wang, Xin wrote:
Hello, Freesurfer group,
The mri_vol2surf only register the fMRI activity at a certain depth of cortex, as specisfied by -projecfrac, to the cortical surface. mri_surf2surf does the same thing. I want to identify any cortical region have activation during the task, therefore, I need to project fMRI activity of entire depth of cortex onto surface. Some regions may have activity in different depth of cortex, Ideally, the significent level of these regions reflect the peak of the activity cross entire depth or the sum of significense of entire depth.
the --interp trilinear may do some toward my goal, but it elimit many activities compare to nearest.
Thanks,
Xin Wang
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